package builtins

import (
	"monkey/internal/object"
	"monkey/internal/typing"
	"sort"
)

// Max ...
func Max(args ...object.Object) object.Object {
	if err := typing.Check(
		"max", args,
		typing.ExactArgs(1),
		typing.WithTypes(object.ArrayType),
	); err != nil {
		return newError(err.Error())
	}

	a := args[0].(*object.Array)
	// TODO: Make this more generic
	xs := []int{} //make([]int, len(a.Elements))
	for n, e := range a.Elements {
		if i, ok := e.(*object.Integer); ok {
			xs = append(xs, int(i.Value))
		} else {
			return newError("item #%d  not an `int` got=%d", n, e.Type())
		}
	}
	sort.Ints(xs)
	return &object.Integer{Value: int64(xs[len(xs)-1])}
}